Method of impregnating cables



J y 21, 1931- w. A. DEL MAR 1,815,706

METHOD OF IMPREGNATING CABLES Filed May '7, 1928 25% I Z4 15 j! OOOOOO Z] If Z5? W INW.

'Uf-M, M M

. ATTORNEYS.

ab oriooiii, iiisiiiiiiion i3 ooniraotod jDZ ihe insiiiaifmg material sought izo mixed;

Patented July 21, 1931 {TED STATES.

WII: A. DEL HA3; GREEH'WIUH, @fiHIfiECTEiUUT, MSIQNUB Ti) CABLE &: "WIRE CORPORATION, OF NEW "2on3, 33L Y A GOREGMTIGN @3? HEW TIGER KETHOID 01 IMPREGNATIHG LES Application iiea m This invention whites to iecti'idcablos comprising one 02 more conductors surround: 4

od by fibrous or absoibent insulating/flatworm 1n tum surrounded by a layer or layers of material which ordinarily substantially pro vents ozimpedes the introduction of iiqii'i-ni so the insuiatioii through such ia-si maii sioiiafil layer or layers.

It bsiiig dosirabie to improve the function of the fibrous or absorbent iiisuiaibmg maieiiai and ihereb increaso effioisncy oi? the oiibis by a equate and proper impre flfiifiifiig '1" have) invented ii insihod whom-91y such impm naiion be eioc ii'veiy and. iififi lmmififl fy ashamed According to my meizhod 51 1a or ho pa szig e ii io impiegmaiing mafia-axial to Lmfsiom-ci D12Li56IPiiE1 is or oXpmi-fli, 1; the poimiiisimg oiitz'mico oi: mating iiiio oxzemsivo coma.

facilitate disciooure midi h my HOT 6i moihod I shall Ifff kw-o o2? simoioi oi MW many oihor forms of mi 1 Winch ii, be appiioii midi Wmia; QQW eonsiiiisi the 'pi'e'fe I miner n to carry this invoiitioii iiii,

i to ho umiei'siodfi howovoi may piiiomicodi iii other ways and upon DYE-Z1191 am 1-6:: Wiihiiii iahe scope of appended Qifljlfflfi;

iwiieriisog to tho drawings 1g" 1 11E} fmgmoiiwiy iongiiiifliimi pimziy brokosa ii /my of a mbie isiiiod cable izo which tho inveiiiioii neiicmiy Wom d lapping 131 tape 11 of: fibrous or absoi'bent insuiai iig mow -imlioriiiywwoi i d app'mg band. or tape 1% of coppsi oi" oizhw ioctrically conductivo mate rial which is subataniiaily liquid-tigiai ogcopi 1193s. iiewiai 23o. iima at the perforations 13 Notwithstanding iii "$11. 5 "following I the assombiage to My heat to cause moisiiii-a commonly 5 coiiuaiiie maotios to be 'Eroi o cent, by sigzii) to ma ofii, omisii'lp; the pro -52m" o shrink volume or: sis $910116 tion 05 heat simi iw y muses ifiho metal mp6 12 b0 EXP 511d In the paper 11 incomes :reiiiiiw- 1y ocso its siii'iouiici envoiogie 1L2 iiiid'by 1. homiii ("found i i -L sigiii s-smbiage iii condition is ii 011 o? other suitable impiiquid or *COWZOZEHQQ finds iis w v "ii somoamti'veiy quic in y impregn was tho 11 Ebosomos impregnated i5". is em'veiom 12 which con "smpozi 1 i-hop mi" eve/3 1 Li more yo i 3 01 om gm'ii voimmoo The pages? 01 lifigllifiifllfigfi ii however, rosimiiieci o limited in iis sweii tho of onveiopo 12 and.

imi oby put .iimioi Qomsidombio pressure,

tho miwim'dzageous T-ESUH) of om"; iahii'i; be gz-r-asem and. eiiectiiig oompieie impiegiiaiioii.

The same meihori may 33o employed mp1;

[1% expansion oi iho hit-er the bums when the tape 12 is imperforat'e as shown in Fig. 2. 14 indicates the usual lead sheath.

' twill be understood that the degree of heat, the time of its application, the time of subjection to the impregnating material, and the rate of cooling to ordinary temperature, are all factors do din u n the ty ofeable being treate the kind of materia employed, the degree of impregnation desired for that particular cable, etc. These factors will be within the skill of the average man in this art after reading the foregoing dis: closures and explanations.

In accordance with the provisions of the patent statutes, I have herein described the principle of operation of my invention, together with the apparatus which I now consider to' represent the best embodiments thereof, but I desire to have it understood that the apparatus disclosed is only illustrative and that the invention can be carried out by other means. Also, while it is designed-t0 use the various features and elements in the. combinations and relations described, some of these may be altered and others omitted and some of the features of each modification maybe embodied in the otherswithout interfering with the more general results outlined, and the invention extends to-such use.

What I claim is 1. The method of impregnating an absorbent envelope of. fibrous insulating material surrounding an electrical conductor and in turn surrounded by an envelope consisting of a helically wound band of metal which ordinarily impedes passage of theimpregnating material, which method comprises causin the first mentioned envelope to contract wit respect to the second mentioned envelope by the application of dry heat, causin' the second mentioned envelope to ex am? with respect to the said first mentione envelope and to loosen the turns of the second mentioned envelope by the application of heat, subject -ing the amembla e in such condition to impregnating liquid insulating material to I cause the latter to pass through the second mentioned envelope into contact with the first mentioned envelope, causing the first 4 mentioned envelope to expand, and causing the second mentioned envelope to contract,

by coo v 2. T li dfinethod of impregnating an absorbent envelope of fibrous insulating material consisting of a helicall wound bandof paper surrounding an e ectrical conductor and in turn surrounded by an envelo consisting of a helically wound band 0 metal which ordinarily im des passage of the impregnating materi which method com- .prises causing the-first mentioned envelope tocontract Wlth" respect to thesecond mentioned envelope by the. application of dry heat, causin the second mentioned envelope to expand with respect to said first mentioned subjecting the. assemblage ammo:

envelope and to loosen the turns of the second mentioned envelope by the application of heat, subjecting the assemblage in such condition to a bath of the impregnating liquid insulating material to cause the latter to pass v velo into contact with the first mentioned enve ope, causing the first mentioned envelope to expand, and causing the second mentioned envelope? to contract, by cooling.

the latter to pass from the outside of the swond mentioned envelope inwardly through openings into contact with the first mentioned 8111 815310. 4. e method of impregnating an absorbent envelope of insulating material surroun an electrical conductor and n turn surroun ed by an envelope which ordinarily im es passage of the impregnatingmateria which method comprises causing the second mentioned envelope to ex and with res ct to the said first mentione envelope, and subjecting the assemblage in such COIldltion to'impregnating insulating material to a cause the latter to pas from the outside of the second mentioned envelope inwardly through openin into contact with the first mentioned envelope.

5. The method of impregnating an absorbent envelope-of insulating material surrounding an electrical conductor and turn surrounded by an envelo which ordinarily mpedes passage of the impregnat ng material, which method comprises causing the first mentioned envelope to contract with respect to the second mentioned envelope, causing the second mentioned envelope to expand with respect to said first mentioned envelope, and in such conditlon to impregnating insulating material to cause the latter to pass from the outside of the second mentioned envelope inwardl through openings in the secon mentione envelope lnaterial, which met 0d comprises causutig the first mentioned envelope to contract wi through the second mentione enan electrical conductor and in turn surin the second mentioned envelope in the second mentioned envelope ows/0e respect to the second mcntioneel envelope by the application. ofdry heat, causing the see- 0nd mentioned envelope to expand with re spect to 'seicl first mentioned. env'elo e, snle= jecting the assemblage in such CGIIdItiOIi to impregnating liquid. insulatin cause the letter to pass from t e outside of the second mentioned envelope inwerfily through openings 'in the second mentioned envelope into contact with the first mentioned; envelope, causing the first mentioned enve= lope to expand, and causing the seooml mentioned envelope to contract, by ccolinn In testimony whereof '1 hereto it: my

signature WILLIAM Ac BEL MAR,

materiel to e 

